His character, Andy, was supposed to show up to the house of ex-girlfriend Anne (Rashida Jones) completely naked, catching Leslie (Poehler) off-guard when she opened the door. But instead of wearing the industry-standard nude boxers, Pratt, 35, secretly stripped down.

"So I show up in these skin-colored briefs, and it's at the end of the day, I'm not quite eliciting the response that I was hoping to from Amy," he explained. "I was like three or four takes in. And to Mitch, our boom operator, I was like, 'Mitch, I'm gonna go snake out on this one. I'm gonna go naked.' And he's like 'Oh gosh, I don't know.' I was like, 'Too late!' "

"This is just Method acting at its best," Meyers quipped.

The hilarious take made the episode's final cut – though NBC execs definitely didn't enjoy the joke. Watch the video below to see Poehler's priceless reaction.